A temperature difference estimated value is found from a video signal using a temperature estimated value representing the temperature of the panel outer periphery of a display screen of a PDP and a reference value representing the temperature of the panel outer periphery of the PDP which is outputted from a panel periphery temperature setter by a temperature difference estimator, and the luminance of an image displayed on a display is controlled depending on the temperature difference estimated value by a controller and a brightness controller.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A display device, comprising: a display having a display screen including a plurality of regions, that displays an image with a luminance related to a video signal, and an outer peripheral portion adjacent to said display screen; a temperature estimation device that estimates, from said video signal, a temperature value corresponding to a temperature of said display screen; an operation device that determines a temperature difference estimation value in accordance with a reference value related to said temperature of said outer peripheral portion, and said temperature estimation value; and a control device that extracts a peripheral region, from among said plurality of regions, that is adjacent to said outer peripheral portion, said control device lowering a luminance level of said peripheral region as said temperature difference estimation value increases.
2. The display device of claim 1 , wherein said reference value is selected from among a plurality of reference values that differ in accordance with a position of said outer peripheral portion of said display.
3. The display of claim 1 , further comprising: a measurement device that measures said temperature of said outer peripheral portion of said display, said measurement device outputting a reference value, corresponding to said measured temperature, to said operation device.
4. The display of claim 1 , wherein said temperature estimation device estimates said temperature estimation value corresponding to said temperature of an outer periphery adjacent portion in said display screen adjacent to said outer peripheral portion.
5. The display of claim 1 , wherein said display comprises: a first board; a second board; and a plurality of light emitting elements that form said display screen which are interposed between said first board and said second board, an outer periphery of said first board being joined to an outer periphery of said second board, said outer peripheral portion of said display comprising a portion between certain light emitting elements positioned in an outermost periphery of said display screen and a joint portion of said first board and said second board.
6. The display of claim 1 , wherein said temperature estimation device subtracts data corresponding to an amount of dissipated heat from an integrated data related to said luminance from said video signal to obtain said temperature estimation value.
7. The display device of claim 1 , wherein said control device lowers a maximum luminance of said image as said temperature difference estimation value increases.
8. The display device of claim 1 , wherein a gray scale of said image is selected from among a plurality of gray scales, said control device lowering said luminance of said image at a same ratio for each of said plurality of gray scales.
9. The display device of claim 1 , wherein a gray scale of said image corresponds to said video signal in a plurality of light emitting formats which are the same in a total number of gray scales, but which differ in a number of light emitting pulses on each of said gray scales, said luminance of said image being controlled in accordance with a selected light emitting format, said light emitting format being selected based upon said temperature difference estimation value out of said plurality of light emitting formats.
10. A display device, comprising: a display having a display screen including a plurality of regions that displays an image with a luminance related to a video signal, and an outer peripheral portion adjacent to said display screen; a temperature estimation device that estimates, from said video signal, a temperature value corresponding to a temperature of said display screen; an operation device that determines a temperature difference estimation value in accordance with a reference value related to said temperature of said outer peripheral portion, and said temperature estimation value; and a control device that extracts a peripheral region, from among said plurality of regions, said control device setting a luminance level of said peripheral region to be lower than a luminance value of a block inside said display screen.
11. A display device, comprising: a display having a display screen including a plurality of regions that displays an image with a luminance related to a video signal, and an outer peripheral portion adjacent to said display screen; a region extraction device that extracts peripheral regions adjacent to said outer peripheral portion from said plurality of regions; a temperature estimation device that estimates a temperature value, from said video signal, said temperature estimation value being related to a temperature of said display screen for each of said peripheral regions; an operation device that determines a peripheral region temperature difference estimation value using a reference value that corresponds to a temperature of said outer peripheral portion and said temperature estimation value estimated for each of said peripheral regions; and a controller that controls a luminance level for each of said peripheral regions in accordance with said peripheral region temperature difference estimation value.
12. A display device, comprising: a display having a display screen including a plurality of regions that displays an image with a luminance related to a video signal, and an outer peripheral portion adjacent to said display screen; a region extraction device that extracts peripheral regions adjacent to said outer peripheral portion from said plurality of regions; a temperature estimation device that estimates a temperature value, from said video signal, said temperature estimation value being related to a temperature of said display screen for each of said peripheral regions; an operation device that determines a peripheral region temperature difference estimation value for each of said peripheral regions from said estimated temperature value estimated for each of said peripheral regions, said operation device using a reference value that corresponds to a temperature of said outer peripheral portion and said temperature estimation value estimated for each of said peripheral regions, said operation device using a maximum peripheral region temperature difference estimation value to determine said peripheral region temperature difference estimation value; and a controller that controls said luminance of said image in accordance with said maximum peripheral region temperature difference estimation value.
13. The display device of claim 12 , wherein said controller controls said luminance for each of said peripheral regions such that an amount of controlled luminance between adjacent peripheral regions is smoothly changed in accordance with said peripheral region temperature difference estimation value.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
November 28, 2001
January 21, 2003
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